There comes a moment when you commit to someone or something, which is the same as admitting that you love that person or thing. You stop holding back, and you give yourself with gusto and abandon. But in so doing, you give another power to hurt you and thereby to change you. Never commit, never love - and you never get hurt. Also, you never live.
Life itself is love - the extrusion of self into the world. That makes Jesus the personification of God's love. Living love, wholly love, utterly selfless. He kept nothing back.
Funny thing is, the more self extruded, the more a harsh world chops it off, the less "self" you have left. In losing earthly self, you find eternal self. The soul shines brighter and more pure. And so the strangest paradox of all is this - the more you love, the less this world can touch the essential you.